Keymap High Address Register

Number	$28
Readable	Yes
Writable	Yes
Short Description	High address of Keymap (MSB in bit 0), read palette value from $44

Write:

 bits 7:1 = Reserved, must be 0
 bit 0 = MSB keymap address

Read:

 bits 7:0 = Stored palette value from Enhanced ULA Palette Extension ($44)